book: binary prefixed are defined by IEC and not in SI

[mina86]

Binary prefixes (such as Gi for ‘gibi-’ in GiB) are defined by
International Electrotechnical Commission (IEC) and not in the
International System of Units (SI).

Though to be honest I’d just reword the previous paragraph to use ‘1 GiB’.

[rust-highfive]

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[bors]

☔ The latest upstream changes (presumably #39633) made this pull request unmergeable. Please resolve the merge conflicts.

[steveklabnik]

I think you mixed up your branches; this appears to be the text of #39775 ?

[mina86]

Fixed.

[steveklabnik]

@bors: r+ rollup

thanks!

[bors]

📌 Commit 8685adb has been approved by steveklabnik